What is Buddy System?

Legal Definition
The buddy system is a procedure in which two people, the "buddies", operate together as a single unit so that they are able to monitor and help each other. As per Merriam-Webster, the first known use of the phrase “buddy system” goes as far back as 1942. Webster goes on to define the buddy system as “an arrangement in which two individuals are paired (as for mutual safety in a hazardous situation).” The buddy system is basically working together in pairs in a large group or alone. Both the individuals have to do the job. The job could be to ensure that the work is finished safely or the skill/learning is transferred effectively from one individual to the other.
-- Wikipedia
Legal Definition
A cooperative arrangement whereby individuals are paired or teamed up and assume responsibility for one another's instruction, productivity, welfare, or safety.